Pull descriptions ending with git trailers (for example Co-authored-by, Reviewed-by, Ticket) were rendered as a single wrapped paragraph because markdown treats single newlines as soft breaks. Normalize only trailing trailer blocks in pull bodies by converting trailer line separators to markdown hard line breaks (" \n"), then render through the existing markdown and sanitizer pipeline.
This keeps normal markdown behavior unchanged and avoids custom HTML rendering logic. The pull header template now uses markdownPullBody, and tests cover trailer normalization plus unchanged non-trailer cases.
AI-assisted: OpenCode (Openai GPT-5.3 Codex) Signed-off-by: Alessio Caiazza code.git@caiazza.info